what do you think you know about physics, physics is the study of matter under the effect of energy, but does this includes solid states bodies, atoms at ground states, object at microscopic size or object moving faster than light? these and more is what prompt me to ask again what is physics?
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the half life of thorium 227 is 18.72 days , how many of the original will remain after two month
in a
two month period we have60 days ,
roughly three halflife is going to pass, therefore after three half life
period, 12.5% will remain.
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